When to plant Bambara groundnut in Shai Osudoku

Greater Accra, Ghana

Bambara groundnut (Vigna subterranea) is one of Africa's own beans — a tough, low, bushy plant, often grown by the women of the household on the poorest, sandiest land where maize would fail.

Bambara groundnut in Shai Osudoku, rain-fed and with irrigation
Measure	Rain-fed	With irrigation
Fit	Favourable
When to plant	25 Mar 2027 – 8 May 2027 opens in 25 weeks	22 Mar 2026 – 8 Oct 2026
Expected harvest	about 2.0 t/ha	same
Harvest	From 23 Jun 2027 to 25 Oct 2027, depending on the planting date
Ready to harvest	90–170 days after planting
Work it takes	77–157 days per hectare, by hand

Rain-fed. These dates are worked out from each place's own rainfall, for a field watered by the season — with irrigation a window can open earlier, close later, or come round more than once a year. Check your own field under What grows, or get the Divisi app for a calendar dated to your farm.

If you only get one chance to plant, aim for around 5 Apr 2027. That is the point in the window where the rains are most reliably established.

This season's rainfall outlook for Shai Osudoku leans dry, so these dates sit later than the long-run average. Planting on the date you are used to risks germinating into a false start and having to replant.

Planting after 8 May 2027 leaves the crop short of season: it runs into the dry months before it has finished filling.

What decides this in Shai Osudoku

Rain and temperature	96%
The soil	96%
The lie of the land	88%

For bambara groundnut in Shai Osudoku, the lie of the land is the tightest of the three at 88%. You cannot flatten it, but you can farm it: plant along the contour rather than up and down, ridge or tie ridges to hold water on the slope, and expect shallower rooting than the crop would manage on flat ground.

The 2027 season in Shai Osudoku

Rainy seasons	One each year — one chance to plant, so timing carries it
When the rains are expected	March 2027 to December 2027
Rain in a typical year	About 990 mm
This season's rain	Leaning dry — September and October look short of rain. Plant at the early end of the window, favour quicker and more drought-tolerant crops, and keep moisture in the soil: mulch, and weed early.
This season's heat	Hotter than usual — about +0.5 °C over the growing months. Heat makes the same rain do less, so a dry spell bites sooner: do not plant late, and shade or mulch what you can.
What that supports	enough rain for a long crop, or two in a year, warm all year, so nothing but rain ends the season
Ground this covers	4 kinds of ground. The season below is the largest that farms — about 59% of this area.

Agro-ecological zones covering this area
59%	enough rain for a long crop, or two in a year; warm all year, so nothing but rain ends the season 276 growing days · about 1,000 mm · March to December
30%	enough rain for one full main crop; warm all year, so nothing but rain ends the season 268 growing days · about 960 mm · March to November
6%	enough rain for one full main crop; warm all year, so nothing but rain ends the season 260 growing days · about 950 mm · March to November
5%	enough rain for a long crop, or two in a year; warm all year, so nothing but rain ends the season 303 growing days · about 1,030 mm · February to December

last updated 30 September 2026

Frost and pest pressure hold back about 15% of yield here.

What bambara groundnut needs to grow here

Soil it likes	well-drained sand or sandy loam soil
Soil sourness (pH)	Happiest between pH 5.0 and 6.5
Spacing	40 cm between rows, 15 cm between plants
Feed it most with	phosphorus and calcium

What it takes to grow bambara groundnut in Shai Osudoku

Planting material	About 125,000 plants per hectare
Nitrogen (N)	About 100 kg per hectare — the crop fixes most of this itself; inoculated seed matters more than a bag
Phosphate (P₂O₅)	About 20 kg per hectare
Potash (K₂O)	About 50 kg per hectare
In the shops	A basal compound at planting — Compound D, or an NPK blend — covers the phosphate and potash. Skip the nitrogen top dressing; inoculated seed does that job.
Hand work	77–157 days per hectare, by hand

These are the nutrients a bambara groundnut crop of that size carries off the field. What you actually apply depends on what your soil already holds — which is what a soil test, or the app's field records, tell you.

What to watch for

Pest/disease risk — manageableSoil pH below the crop's optimum

Grow Bambara groundnut with a plan, not a guess

Everything above describes Shai Osudoku as a whole — your own soil, slope and rainfall will shift the dates. The Divisi app works them out for your field, and dates each job that follows.

Or check your field first

Bambara groundnut in nearby districts

How to grow Bambara groundnut, step by step Land preparation to harvest — every task, in order

Frequently asked questions

Will bambara groundnut grow well in Shai Osudoku?

Shai Osudoku rates as favourable for bambara groundnut.

When should I plant bambara groundnut in Shai Osudoku?

Typically 25 Mar 2027 to 8 May 2027, forecast-adjusted.

Is this exact for my own field?

No — these are readings taken across Shai Osudoku, not on your field. Soil, slope and rainfall change from one farm to the next. Check your own location to see your own numbers.